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나운학,Na, Un-Hak 한국열병합발전협회 2003 열병합발전 Vol.36 No.-
For many years, T/G Supplier has constructed a number of thermal power plants and researched to improve the performance and the reliability of steam turbine, which are achieved by advances in design and materials technology. In recent, interest is renewed in advance steam condition as means of improving economy of thermal power plant and reducing environmental pollution. Improvements in the maximum power have been driven by the development of advanced rotor and bucket material and longer last stage bucket. Improvements in efficiency have been brought through advance in mechanical efficiency and thermodynamic efficiency. This paper describes a number of new steam path design features introduced to the steam turbine product. And also this paper describes new design technologies' development, new technologies' trend and technologies' development for ultra-super critical steam turbine.
상부패드의 형상변경을 통한 증기터빈용 Anti-spragging 틸팅패드 저널베어링 개발(2-1)
나운학,Na, Un-Hak 한국열병합발전협회 2006 열병합발전 Vol.50 No.-
The tilting pad journal bearing has widely used to support high pressure/high rotating turbine rotors owing to their inherent dynamic stability characteristics. However, fatigue damages in the upper unlcaded pads and the break of locking pins etc. by pad spragging were continuously taken place in the actual steam turbines. The purpose of this paper is to develope a new bearing model that can prevent bearing damage problem effectively by pad spragging in a tilting pad journal bearing. A new bearing model which has a wedged groove is suggested from the studies of spragging mechanism performed by previously research works. The spragging characteristics of the upper unloaded pad are studied experimentally in order to verify the reliability of a new bearing model. It can be known that the phenomenon of pad spragging nearly does not occur in the new bearing model under the various experimental conditions. And it is observed that any kinds of bearing failures by pad spragging does not detect in the application of actual steam turbines.
나운학(U.H.Nah),조성일(S.I.Cho),신훈(H.Shin),김영상(Y.S.Kim),양승헌(S.H.Yang) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
For many years, T/G Supplier has constructed a number of thermal power plants and researched to<br/> improve the performance and the reliability of steam turbine, which are achieved by advances in design and<br/> materials technology. In recent, interest is renewed in advanced steam condition as means of improving<br/> economy of thermal power plant and reducing environmental pollution. Improvements in the maximum power<br/> have been driven by the development of advanced rotor and bucket material and longer last stage bucket.<br/> Improvements in efficiency have been brought through advances in mechanical efficiency and<br/> thermodynamic efficiency. This paper describes a number of new steam path design features introduced to the<br/> steam turbine product. And also this paper describes new design technologies' development, new<br/> technologies' trend and technologies' development for ultra-super critical steam turbine.